Chef knife



FIG. 1 is a front perspective view of a chef knife;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines illustrate features of the chef knife that form no part of the claimed design. 

CLAIM The ornamental design for a chef knife, as shown and described. 